如何使用imageicon（Java GUI）将图像添加到JPanel？

Question

I looked all over the place but I am still stuck on how directory works to find the image to put onto the JPanel. Where is the image supposed to be? I clicked on properties for my image and it shows Location: C:\\Users\\Joseph\\Pictures\\Background and the picture's name is random.jpg .

I am trying to add an image to a tab using tabbedPane. Here is what I have so far, and I am not able to do it.

JPanel flPanel = new JPanel();

flPanel.setLayout(new FlowLayout());

ImageIcon image = new ImageIcon(getClass().getResource("")); 
// Tried /Users/Joseph/Pictures/Background/random.jpg and doesn't work

JLabel j1 = new JLabel(image);

flPanel.add(j1);

tabbedPane.add("Tab 2", flPanel);

Is the picture supposed to be in the same package file as the project? Or is it supposed to be in the source file to be able to just do "random.jpg"?

Answer 1

If you want the image to be available to your application at runtime, then you should consider making sure that the image is included within your Jar when you application is built.

From the sounds of it, you are using Netbeans, you should copy the image to a directory within your src directory of your project.

You should then be able to use...

BufferedImage bi = ImageIO.read(getClass().getResource("/full/path/to/image/random.jpg"));
ImageIcon image = new ImageIcon(bi);

The path to the image should be the full path (from the context of the src directory) within your project.

That is, if you placed the image in the resources directory within the src directory, then you would use /resources/random.jpg as the path/file name

Take a look at Reading/Loading an Image for more details

Answer 2

getClass().getResource(...) will only get resources inside the classpath.

You can use ImageIO.read(File) like this:

BufferedImage bi = ImageIO.read(new File("C:\\Users\\Joseph\\Pictures\\Background\random.jpg"))
ImageIcon image = new ImageIcon(bi);